And allan mason



(No Model.)

J. WILSON` S-MASON@ JPRGGESS '0R MBTHQD 0F MAINTmNNG -QOMBVUSTION INSECONDARY CHAMBERS off- BUILB-,oR-oHBR PURNAGES..

Patented-@5.0L 2l',

UNITED STATES JOHN WILSON, OF NEW YORK, AND ALLAN MASON, OF BROOKLYN,ASSIGNORS TO HERBERT H. SANDERSON, TRUSTEE, OF NEW YORK, N.

PROCESS R METHOD OF MAINTAINING COMBUSTION IN SECONDARY CHAMBERS OFBOILER OR OTHER FURNACES.

PATENT SPECIFICATION forming part of Letters Patent No. 438,872, datedOctober 21, 1890.

Application filed December 5, 1887. Serial No. 256,997. (No model.)

To all whom it may concern:

Be it known that we, JOHN WILSON and ALLAN MASON, citizens of the UnitedStates, residing, respectively, at New York city and Brooklyn, New York,have invented certain new and useful Improvements in the Process orMethod of Maintaining Combustion in Secondary Chambers of Boiler andother Furnaces; and we do declare the following to be a lo full, clear,and exact description of the invention,such as will enable othersskilled in the art to which it appertains to make and use the same,reference being had to the accompanying drawings, and to the letters ofreference marked thereon, which form a part of this specification.

Our invention relates to boiler and other furnaces in which one or moresecondary combustion-chambers are employed, with the zo objects ofsecuring more effectual combustion of the gaseous portions of the fueland more effective application of the heat than are obtained with asingle combustion-chamber. It is especially designed for the greater andmore economical development of steam in marine and other boilers throughthe instrumentality of a secondary combustion-chamber at the rear oropposite end from the primary furnace-chamber and communicating 3o withit to receive and consume the unconsumed gases and to return the heatproducts through the upper portion of the boiler; but our invention isalso designed generally for all similar or other furnaces in whichsecondary combustion may be advantageously utilized, as hereinafterfully described, reference being made to the accompanying drawings, inwhich- Figure l is a longitudinal sectional eleva- 4o tion of aboiler-furnace, showing the application of an auxiliary hydrocarbon irein the secondary combustion-chamber for effectual combustion of thegases entering said chamber from the front or primary chamber, in

which We have in this instance represented apparatus for the use ofhydrocarbon fuel and steam; but coal or gas fuel may be used in` stead,as preferred. Fig. 2 is a horizontal section of a similar furnace, inwhich the auxiliary lire of the secondary chamber is y supported in partby hydrocarbon fuel and in part by coal-slack, bothintroduced with air,the fire in the front furnace being of coal or other fuel, as preferred.Fig.'3 isa longitudinal sectional elevation of a similar furnace, inwhich the auxiliary fire in the secondary chamber is maintained withcoalslaclrblown in and burned on a coal fire, which, being an ordinaryfire made on a coalgrate to begin with, is subsequently maintained andcontinued by the supply of coalslack, the fire in the front furnacebeing produced in this instance with hydrocarbon fuel injected withsteam and air. Fig. 4 is a detail of one of the b urners Figs. l and 2in A ltop view and on an enlargedscale.

We are aware that it has been attempted to consu me in secondarychambers such gases as" fail of complete combustion in the first chamber, it being supposed that, sufficient rooln being provided, the heatof the primary chamber would be sufficient for'eifectingsuch combustion;but we find such method is a failure practically, although it may Workat times and under some circumstances; but generally the` 7`5 gases aretoo much chilled to insure continuous combustion, and when extinguishedby fall of temperature or other causes fail to relight even whenconsiderable increase of temperature takes place. Hence we find anauxiliary re in the secondary chamber an imperative necessity forpractical efficiency; but-W such a fire as is commonly made byintermittent supplies of fuel through the ordinary re-door will not do,because when the door is opened it stops the draft in both lires,besides admitting cold air in great excess, and therefore materiallyinterferes with both fires; and if a fan-blower is used to urge the mainfire, as is commonly the case with marine boilers, the door cannot beopened Without first stopping the fan, and the fan also interferes withmagazine-feeders and other automatic stokers for the auxiliary fire byforcing more or less gas ont through them. To overcome these dilcultiesand to secure a reliable and uniform auxiliary fire adapted to insure d.eectual combustion of the unconsumed gases fromthe main fire, We havecontrived a systemvhich comprises the continued and unobstructed forcedsupply of the elements of combustion in various forms to the continulally-closed secondary chamber in addition to the gases entering it fromthe main furnace, and in such manner as to accelerate the natural draftof the main furnace and to be alike available with a forced draftthereto, the arrangement being such that the same is controllable at thefront, Where themain fire is tended, and so that the apparatus isapplicable to and detachable from ordinary furnaces constructed with asecondary chamber Without change or permanent attachment.

The apparatus which We prefer to use is variable to some extent, at theoption of the constructor and for different forms of the combustibles tobe used, and is reserved for separate applications for patents.

In the boiler-furnace represented in the drawings, a indicates the mainor primary combustion-chamber, and b the secondary chamber, each havingthe customary lire-door c and aslrpitdoor d, with the usual system offire-tubes ecommunicating between them, also the return system of tubesf, connecting the secondary chamber Withthe smoke-tine g.

In Figs. 1 and 4 we represent an injecting for combustion in the mainfurnace, h being a steam-nozzle, t' an air-inlet funnel, and j anoil-feeding tube, one or more of the latter beingsaI-rto deliver oil onthe upper surface 3 5 of the steam nozzle, which may have agroove orgrooves to conduct the oil off the end of the nozzle suitably to mix andatomize or vaporizewith the steam and air, the steam-nozzle to besuitably connected with the boiler, and the oil pipe or pipes to beconnected with any source of supply, with suitable regulatingcocks orother devices, and all being suitably M* connected with the furnacethrough the firedoor of the first combustion-chamber. With these methodsof producing combustion in the main chamber a we provide for anauxiliary fire in the secondary chamber b by a series of oil-burners n,supplied with oil and air through the ash-pit and one or more of thelire-tubes n- 5o c by the pipes 0 and Z, and any approved apparatus forthe use of oil, steam, and air means of injecting them, with which Wemay also burn coal-slack, to be forced in through a pipe or pipes m by afan p 0r other means, or We may use the coal-slack with an ordinarycoal-iire q to begin with and to be subsequently maintained by thecoal-slack alone.

vVthile we find it `preferable to introduce the fuel into the secondarychamber through the main furnace-chamber, We may of course arrange theconductors to enter throughthe y ash-pit door of the secondary chamber;but

solely in the chamber containing the metal,

and We disclaim such method, ours being to burn to the best possibleadvantage in both chambers in boiler and such furnaces 'as are adaptedfor alike utilizing heat from both.

What We claim, and desire to secure by Letters Patent, is-

The inxproved process of producing and utilizing heat in a boiler orotherlike furnace,

consisting in producing a fire in the ordinary f urnace-chamber,introducing the heated products thereof into a locally separatesecondary combustion-chamber of said boiler or other furnace, andseparately introducing and burning therein a continuous forced supply ofother fuel elements, in combination with the products from the primarychamber after being largely cooled by coming in contact with the boilerand While passing from the primary to the secondary chamber,substantially as i described.

In testimony whereof we aix our signatures in presence of two Witnesses.

JOHN WILSON. ALLAN MASON.

Witnesses:

W. J. MORGAN, J. J. MCDERMOTT.

